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A buyers agent in Southern Adelaide is a licensed agent who acts only for the buyer, never the seller. Citadel Agency is a buyers agency based in Preston, Victoria, that helps investors buy in Southern Adelaide and across Australia, with suburb research, on and off market sourcing, due diligence and negotiation through to settlement.
Consumer Affairs Victoria describes a buyer’s agent as a licensed estate agent who, for a fee, acts for a buyer instead of a seller. A selling agent works for the vendor. We work only for you: we find and shortlist properties, look at ones that are never advertised, check each one, and negotiate or bid at auction for you.
Citadel Agency was founded by Omar De Guise and Jadd Chahal. Every purchase is backed by our own suburb research, so your Southern Adelaide decision is made on evidence, not on a sales pitch.
Source: Consumer Affairs Victoria. Check any agent on the public register.
Southern Adelaide covers the Onkaparinga and Marion council areas. The orange outline on the map shows the boundaries.
COUNCIL AREAS
Onkaparinga, Marion
LAND AREA
574 km²
Boundary: Australian Bureau of Statistics, ASGS 2021 (CC BY 4.0). Map data © OpenStreetMap contributors.
| Population | 286.1K people in the Onkaparinga and Marion council areas in June 2025 (Onkaparinga 184.8K and Marion 101.2K, ABS) |
|---|---|
| Projection | 313.6K projected for 2041 (SA Government local area projections, March 2024, medium series) |
| Of occupied homes are rented | 25% (26,713 rented dwellings, 30% in Marion, ABS 2021 Census) |
| Major projects | Main South Road duplication, Aldinga to Sellicks Beach (opened); Majors Road Interchange (opened); River Torrens to Darlington (T2D) (under construction) |
| Government | South Australia is led by Premier Peter Malinauskas (Labor), returned at the March 2026 state election. |
| Latest rule changes | Bond cap, bidding ban and annual rent rises (2023 to 2024); No-cause evictions ended (1 July 2024); Greater Adelaide Regional Plan (17 March 2025) |
| Citadel purchases here | None published yet. See our results across Australia |
South Australia is led by Premier Peter Malinauskas (Labor), returned at the March 2026 state election. These are the changes that matter most to investors.
Southern Adelaide is a large, established part of the metro area where about one in four homes is rented, and its road links have improved with the duplicated Main South Road and the new Majors Road ramps while the T2D motorway is built. We weigh that against supply and holding costs before recommending any suburb in southern Adelaide.
Population: ABS, Regional population 2024-25, SA Government, Local Area SA2 and LGA Population Projections 2021 to 2041 (March 2024), ABS 2021 Census QuickStats, Onkaparinga, ABS 2021 Census QuickStats, Marion. Projections are government projections, not forecasts by Citadel Agency.
Values from comparative market analyses (CMA). Suburb only, no client details. Past performance is not a reliable indicator of future performance.
I have purchased multiple properties over the years however was stuck for over 6months trying to get into the Melbourne and Tassie market. I reached out to the team and in a few weeks they secured me 2 great properties. I will use Citadel for all future purchases going forward. 10/10
A buyers agent in Southern Adelaide acts only for the purchaser. We set your brief, research suburbs on growth, rental demand, supply and risk, find on market and off market property, check each one, and negotiate or bid for you through to settlement.
Yes, when Southern Adelaide suits a client's strategy and budget. We research suburbs across Australia and only recommend Southern Adelaide when the numbers work for you. Our recent purchases are listed by suburb on our results page.
No. Most of our clients buy interstate. We research, arrange inspections through local partners, negotiate and manage the purchase to settlement, and keep you updated at every step.
At 30 June 2025 Onkaparinga had 184,827 residents and Marion 101,229, about 286,000 combined (ABS, March 2026). That is up from 272,205 in 2021, the base year of the SA Government's local area projections.
The SA Government's local area projections (March 2024, medium series) put Onkaparinga at about 203,700 residents and Marion at about 109,900 by 2041. That is about 313,600 combined, up from 272,205 in 2021.
At the 2021 Census, 22.6% of occupied homes in Onkaparinga and 29.6% in Marion were rented (ABS). Across both areas that is 26,713 rented homes, about 25%.
The $810.4 million Main South Road duplication to Sellicks Beach was completed on 7 February 2026 and the $120 million Majors Road Interchange opened on 15 October 2025 (Department for Infrastructure and Transport). The $15.4 billion T2D motorway from Darlington is under construction and due to open in 2031.
It depends on the price, the type of property, whether you will live in it or rent it out, whether you are a first home buyer and whether you are a foreign buyer. Our free stamp duty calculator uses the published South Australia rates, and your conveyancer will confirm the final amount.
Book a free 30 minute strategy call. We look at your budget, borrowing and goals, and tell you honestly whether Southern Adelaide fits your plan.
We research suburbs across Australia to find the right location for each client's plan.
